No description available.

No description available.

No description available.

This study examined the effect of an 8-week, progressive exercise intervention on neural responses, specifically N2 amplitude as a measure of inhibitory control, to pictures of food. Healthy women ages 18-44 years were randomized to a morning (AM) exercise group or evening (PM) exercise group. The AM group did moderate-to-vigorous intensity exercise on 4 days per week between 6:30 and 9:30 a.m. while the PM group had the identical volume of exercise between 6:30 and 9:30 p.m. Neural responses, eating behaviors, cardiovascular fitness outcomes, and body weight/composition were measured at baseline and after the 8-week intervention. The N2 amplitude in response to pictures of high- and low-calorie foods was assessed using electroencephalography during a go/no-go task. Dietary restraint, emotional eating, and external eating were assessed using the Dutch Eating Behavior Questionnaire. VO2peak, HRmax, and time to completion were measured during a maximal treadmill test. Body weight was measured on a digital scale, and body composition was measured using dual-energy x-ray absorptiometry. There was not a significant task (go, no-go) × group (AM, PM) × period (baseline, 8 weeks) interaction (F = 0.18; p = 0.677), but there was a main effect of exercise over 8 weeks (F = 6.26; p = 0.017) with increased N2 amplitude following the intervention. There was not a significant interaction as a function of picture type (high-calorie, low-calorie), task, group, and period (F = 0.52; p = 0.478). Changes in body weight and neural outcomes were not significantly associated with changes in eating behaviors for either group (ps < 0.05). There was a significant group × period interaction for body weight (F = 4.90; p = 0.032). Body weight increased by 0.79 ± 1.16 kg in the AM group and decreased by 0.21 ± 1.46 kg in the PM group (effect size = 0.77; CI = 0.15-1.35). There was not a significant group × period interaction for body fat percentage, total body fat or fat-free mass (ps < 0.05). When examining the main effect of exercise on cardiovascular fitness outcomes, VO2peak was not different (F = 1.80; p = 0.187), time-to-completion on treadmill increased (F = 6.51; p = 0.014), and HRmax during the treadmill test was significantly lower (F = 5.49; p = 0.025). This study suggests that 8 weeks of exercise training may increase the inhibitory response to pictures of both high- and low-calorie foods. However, time of day of exercise did not influence this response. Eight weeks of exercise training did not change self-reported dietary restraint, external eating, or emotional eating, and there was no correlation between these eating behaviors and inhibitory control. However, evening exercise was more beneficial for body weight than morning exercise. Given the novelty of this study and its results, additional studies on the influence of time of day of exercise on weight management are needed.

Female athletes have been established as a high-risk group for disordered eating due to the high prevalence rates of clinical (i.e., 1.9% to 19.9%) and subclinical eating disorders (i.e., 7.1% to 49.2%). To date, only a few studies have examined the long-term stability of eating disorders in collegiate female athletes, a design that will allow examination of change in prevalence rates over time. Additionally, researchers have attempted to identify psychosocial risk factors in the development of disordered eating, but short time frames (e.g., competitive season, one year) during which data was collected have limited their findings. The current study investigated the progression in prevalence of eating disorder classification (i.e., eating disordered [ED], subclinical ED, asymptomatic), pathogenic weight control behaviors (e.g., laxative use, vomiting), and the predictive ability of psychosocial risk factors (e.g., body dissatisfaction, negative affect) from the time in which female athletes were active collegiate competitors (Time 1) to a time six years later, in which the women were retired (Time 2). By Time 2, the women were categorized as asymptomatic (69.9%), subclinical ED (26.9%), and clinical ED (3.1%). The prevalence of those who were disordered (i.e., either subclinical or clinical ED) increased from 22.8% (Time 1) to 30.1% (Time 2). The athletes, both as active competitors and retired, reported using exercise and dieting/fasting as the most frequent forms of weight control, but to a much lesser degree when retired. The full model explained 14.9% to 21.1% of the variance in disordered eating categories, and correctly classified 73.6% of the athletes in the sample. Dietary intent and sadness significantly predicted their being classified in the disordered eating group. Early intervention efforts that address eating, body image concerns, proper nutrition, and how to eat healthfully when athletes are competing are important and may help to alleviate future distress. Additional clinical implications and limitations are discussed.

No description available.

The primary purpose of this study was to evaluate the effects of a single bout of moderate-intensity exercise on acute (ad libitum lunch) post-exercise energy intake (PE-EI) and 12-hour energy intake in normal-weight and overweight sedentary males. Accuracy in estimating energy intake (EI) and energy expenditure (EE), solid vs. liquid carbohydrate intake, mood, and perceived hunger were also assessed. The study consisted of two conditions, exercise and rest, with each subject participating in each condition, in a counterbalanced-crossover design on two days. The participants were randomly assigned to either the exercise or resting (seated) control condition on the first day of the experiment, and then the condition was reversed on the second day. Exercise consisted of walking on a treadmill at moderate-intensity for 60 minutes. Eighty males, mean age 30+8 years were categorized into five groups according to weight status (overweight/normal-weight), dietary restraint status (high/low), and dieting status (yes/no). The main effects of condition and group, and the interaction were not significant for acute (lunch) or 12-hour PE-EI. Overall, participants estimated EE for exercise at 46% higher than actual exercise EE, and they estimated EE for rest by 45% lower than actual resting EE. Participants significantly underestimated EI at lunch on both the exercise and rest days by 43% and 44%, respectively. Participants with high restraint were significantly better at estimating EE on the exercise day, and better at estimating EI on the rest day. Mood, perceived hunger, and solid vs. liquid carbohydrate intake were not influenced by dietary restraint, weight, or dieting status. In conclusion, a single bout of moderate-intensity exercise did not influence PE-EI in sedentary males in reference to dietary restraint, weight, and dieting status. Results also suggested that among sedentary males, there is a general inability to accurately estimate calories for moderate-intensity physical activity and EI. Inaccurate estimates of EE and EI have the potential to influence how males manage their weight.

The current study replicated and extended previous research by examining empirically the direct and indirect influence of social pressure (to lose weight and diet), social body comparisons, internalization of the thin ideal, body dissatisfaction, self-esteem, and cardiorespiratory fitness on self-reported dietary restraint in a diverse sample of middle school boys (n = 663); Mage was 12.49 years (SD = .99). With IRB approval, parental consent, and child assent, during annual FITNESSGRAM testing, participants completed questionnaires that measured the study’s constructs. Cardiorespiratory fitness (CRF) was determined by the boys’ performance on the PACER running test. The proposed model was examined using structural equation modeling (SEM). Because measures demonstrated univariate and multivariate normality, the maximum likelihood procedure within EQS to examine the measurement and structural models was used. Fit was determined using a two-index procedure. Participants were randomly split into exploratory (Sample A - 331) and confirmatory (Sample B - 332) samples. For Sample A, the measurement and structural models fit the data well. The structural model was confirmed in Sample B, with the same paths being significant and nonsignficant. For both Sample A and Sample B, 35% of the Dietary Restraint variance was explained. These findings support a multifactorial approach to understanding boys’ self-reported dietary restraint, and illuminate the negative influence of sociocultural weight pressures and salutary effects of CRF on early adolescents’ psychosocial well-being and dietary behaviors.

Certain sport environments may contribute to the development of disordered eating and those that heavily emphasize weight and/or body shape can be particularly damaging to an athlete's body image, self-concept, and eating behaviors. In particular, female athletes in collegiate sports are at a greater risk for engaging in unhealthy behaviors because they face both societal pressures from Western culture to be thin, in addition to sport pressures that focus on performance and appearance. According to the American Medical Association almost half of American women are trying to lose weight, illustrating that societal pressures alone to be thin and attractive can influence the development of disordered eating. Athletes are exposed to the same sociocultural pressures as their nonathlete counterparts, and would be expected to have similar feelings about their bodies as women in general. Add subsequent pressures like team "weigh-ins," coaches' body comp preferences, judges' critiques, revealing attire, and endurance/strength demands, and the stage is set for the development of disordered eating. In the current study, participants were 414 Division-I female gymnasts, swimmers/divers, and they completed self-report measures assessing sport pressures, body satisfaction and disordered eating behavior to test Petrie & Greenleaf's etiological model. Results indicate that sport pressures do lead directly to dietary restraint, a precursor to disordered eating, and are not always mediated through internalization and body dissatisfaction. These findings suggest that decreasing and intervening with perceived sport pressures may lessen the risk of female athletes developing an eating disorder.

This thesis is a qualitative investigation of the factors which maintain anorexia nervosa (AN) according to the transdiagnostic theory of eating disorders (Fairburn et al., 2003). AN is difficult to treat and continues to evade complete understanding. The present study aimed to promote further understanding of food restriction and physical activity in relation to the constructs of clinical perfectionism, core low self-esteem, mood intolerance, and interpersonal difficulties. Twenty females with self-reported AN were recruited from Guelph, Ontario and participated in semi-structured interviews. Thematic analysis revealed eight major themes for clinical perfectionism, five for core low self-esteem, five for mood intolerance, and six for interpersonal difficulties. The in-depth emotional accounts and details of food restriction and physical activity in relation to the four constructs examined in this study may contribute to further appreciation of AN, informing practitioners and family members, promoting empathy, and improving treatment options.